<fieldset style="border: 1px solid; padding: 15px; margin: 0 10px 0 10px">
  <legend>Types d'entité à valider (ex: pel, blog, ...)</legend>
<p>
  <textarea name="params[validation_peda]" cols="50" rows="2" value=""><?php echo $vars['entity']->validation_peda;?></textarea><br/>
</p>
</fieldset>